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Product Description
Designed to be compatible with the "LEGO Technic Trains" project, this is a flangeless driver for a functional pneumatic engine, or for steam locomotives in general. The rolling diameter is 7 studs, which I designate 7R. The part overall is 7x7x1 studs. Equivalent to a #17 on the system train wheel size chart.
The Technic Trains rails are 7 studs edge to edge, essentially 1 inch to 1 mm scale (1:25) in Standard-gauge. So this wheel is equivalent to a 56 inch / 1420mm driver.
See flanged 7R wheel description for further details, this part is intended to be used as a companion to that one - same rolling radius, no flange, for 2-6-0s etc.
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